Turbine.



G. H. PLAINB.

TURBINE.

nrmonlou FILED MAY 10, 1912.

Patented Jan. 14, 1913 WITNESSES INVENTOR lard and State of Connecticut, have in TEPST QFFHIE.

GEORGE H. ELAINE, OF HARTFORD, CONNECTICUT.

TU RBINE.

Specification of Letters Patent.

Patented Jan. 14,1913.

To all whom it in (l'l/ concern lie it known that l. G-CORGE H. Pnarxn, a subject of the King of England, and a. resident of Hartford, in the (li'lllflty of Hart- ."cnted certain new and useful Improvementin Turbines, Centrifugalv Pumps, and

the L.ke, of which the following is a specifica tion.

Experience with tluid actuated turbines and centrifugal pumps has shown that any sharp edge,- for example, such as the X3(,Pi\- ing or return edge of a steam turbine. blade when sub ected to the action of a fluid at high velocity will be WOiIf away from the erosive eliect of thetiuid. In other words. that. edgeof the blade in the rotor where the actuated fluid enters the bucket will gradually be eaten away. with the result that: the

efliciency of the apparatus is impaired. it

is in the majority of cases in'ipraetical to make these'blades or buckets of a material sufficiently hard and tough to resist. erosion, either because of the expense of such material, or its insutlicient strength to re sist meehaniial and centrifugal forces, or the dit iiculty in satisfactorily working it.- into those seetins necessary for certain parts of the buckets or guide vanes of fluid actuated turbines and the rotors and diffusion vanes of centrifugal pumps, fans, etc. Consequently, it has been customary and necessary to entirely discard a wheel after the bucket plates have become Worn andreplace it by an entirely new structur This means a very heavy expense both to the manufacturer and the user.

It is the purpose of my nrention to pro- -v1de a simple, convenient. and inexpensive.

method of repairing a wheel after the buck ets or similar parts have been worn away.

One en'ibodinient of the invention is illustrated in the drawings in which-- Figure 1 is a side View of part. of a rotor or bucket wheel, one of the side. plates being partially broken away to show eonstructimi. .Fig. 2 is a bottom View otone ot' the bucketplates. Fig. is a section View on the line 3 of Fig. 3 looking in the direction of the arrow. Fig. .l: is a \'i("\-\,' of a diliierent type of bucket provided with a shoe at both the delivery and receiving edges.

The wheel illustrated is adapted for use in what known as the Terry type of steam turbine. but. it is to be clearly understood bucket plate nection with the turbines of various makes and types, and also in connection with centrifugal pumps, fans and like machinery, and it is to be understood thatthe terms which I employ are used merely for purposes of description and not as limitations.

Referring to Fig. l. (1. denotes one oi the side plates of the wheel, and Z) the other side plate, between which areal-ranged the bucket plates 0 one abort: the other instep formation and with a curved plate (1 interposed between he bucket plates to form the rear wall of the bucket.

Referring to Fig. 2 2 denotes the receiving side of the bucket plate. that is to Say, that side at which the stean'i enters the bucket and f the delivery side, and it is the front edge of the plate at the receiving side 1? indicated by the arrow 9 which is worn away by the e osive action of the aetu ating fluid.

In accordance with my invention I cut away the front edge of the receiving side. of the plate 0 as indicated in Fig. Siprcferably leaving this fr nt edge slightly bevelcth and provide a shoe [1. made (if-inaterial which relatively more resistant to the act-ion of the actuating fluid than the main body of the plate 0. This shoe has an undercut grooYe i to tit accurately the bevel, and a rearwardly extending tail piece 70 which lies against the underside of the bucket plate 0. Rivets m, or other suitable securing means, are. provided to hold the shoe in place. The wheel can be originally provided with these shoes, or if a solid used, it can be cut down on the receiving: side when it is worn away and these shoes titted to it. In this way it is possible to nuike this receiving edge of the bucket plate of dit fere'nt metal or diff'erent temper or degree'ot hardness of the same metal which will withstand the erosive action of the actuating fluid to a Very much greater extent than will the material from which the main part of the plate (1 is made.

' and when the. shoe Wears away, it can be removed and replaced by a new one very readily. Another advantageous feature of this construction that the tail reduces the depth ottheentering partof the re. cciving' side at the chamber having eholc ing or ell'eet. as it passes into the chanr her, allowing it to expand. and increas ng the etlicicntv of the apparatus. Of course.

that the invention is adapted for use in con the forward end of the shoe is shaped to correspond to the forward end of the plate and at justthe right inclination or angle to properly receive the steam with a. minimum amount of friction. As has been hercinbefore stated, the invent-ion is adapted for use in turbines of. various types and also in centrifugal pumps and other machinery where an erosive action mayoccur. The use-of my invention will obviate the present necessity of scrapping complete wheels or complete blades which are perfcctly good except for the slight wear at the receiving side of-the bucket plates. These Wheels may cost a big, percentage of the total cost of the machine, and as at present made are absolutely useless after they have become worn.

In the claims it is to be understood that the term bucket plate is intended to inelude any plate, guide, vane, difi'usion vane or the like, which receives the actuating fluid and deflects its course of travel.

In Fig. 4 I have illustrated another form of bucket in which the receiving edge is subject to erosive or corrosive action and the delivery edge to corrosive or erosive action and in such a structure I form each edge of suitable material which ,will better resist this action of the actuating fluid than the main body of the blade. The drawing shows a bucket 10 have the main body art 11, a shoe 12 at its receiving edge of cli erent material or of the same material but of diflerent temper, and a shoe 13 at the delivery edgesimilarly made. A bucket thus constructed will wear much longer than as they are now made and provision can be made, if desired, for the removal or replacement of the shoes when they Show any wear after a long continued use.

I claim as my .inv'entionz.

1. A bucket plate adapted for use in devices of the character described the receiving edge of said plate being relatively more resistant to the action of the actuating fluid than the main body of the plate.

A bucket plateadapted for use in devices of the character described the receivshoe which is made of material relatively more resistant to the action of the actuating fluid than the main body of the plate, and

means for securing the shoe in place.

A bucket plate adapted for use in devices of the character described the receiving edge of the plate being provided with a shoe made of material which is relatively more resistant to the action of the actuating fluid than the main body of the plate, and

means for reinovably securing the shoe in away at the receiving side and provided' with a beveled edge, a shoe of material which is relatively more resistant to the action of'the actuating fluid than the material from which the plate is made and havin an undercut groove to fit the beveled edge 0 the plate, a tail piece on said shoe lying against the under face of the'platc, and means for securing said shoe in place.

7. A bucket Plate adapted. for use in machines and devices of the character described, the edge of said plate being cut away at the receiving side, and provided with a beveled edge, a shoe of material which is relatively more resistant to the action of the actuating fluid than the material from which the plate is made, an undercut groove in said shoe lying against the under edge of the plate, and means for securing said Plate in place.

8. A. bucket plate, adapted for use in devices of the character described, comprising a main-body portion and receiving and delivery edges formed from material which is relatively more resistant to the action of the actuating fluid than the main body of the plate. 5

9. A bucket plate adaptedfor use in devices of the character described, the edge of said plate being cut away at the receiving side, a shoe of material. which is relatively more resistant to the action of the actuating 'fiuid than the main body of the plate adapted to fit in said cut away portion and interlocking parts on said shoe and plate.

10. A bucket plate adapted for use in devices of the character described, the receiving edge of the plate being cut away, and a shoe of material which is more resistant to the action of the actuating fluid than the main body of the plate, adapted to fit in and till the cut away portion, and means for removably securing it in place.

GEORGE H. PLATNE. Witnesses:

JAMES VVILLrAMs, JOHN SAINSBURY. 

